Locomotive crosshead



H. GUEST LocoMoTIvE cRossHEAD Filed Dec. 16, '1925 km /za Harig] Gues Patented Nov. 8, 1927.

letali.

HARRY GUEST, BILLERICA, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO GEORGE T. CLARK, OF LOWELL, MASSACHUSETTS. i

Loooiviorivii i vApplication. led December r This invention relates. to al locomotive cross-head constituting a connection .between the piston-rod and the connecting-y rod or pitman reciprocated thereby, the cross-head including a ybody having means for connection with the piston-rod and pitman, and shoes removably seated on the upper and lower sides of the body and formed to slide on the usual cross-head guides, securing means being provided for fixing the shoes to they body.

The object of the invention is to provide an improvedconstruction of the body .and shoes, and improved securing means rigidly connecting the shoes with the body, whereby the bolts heretofore employedare d1s pensed with, the lwell known objections incidental to the employment of said bolts including the loosening of the bolts by the wear to which they are subjected, are obviated, vand the number of parts, the cost of manufacture, and the timerequred for assembling and for compensating for wear, are reduced to a minimum.

yOfhe accompanying drawings forming ay part of this'speoicationf- Figure l is a perspective view of the body of a cross-head embodying the invention.

Figure 2 isy a perspective view of one of the shoes. .4

. Figure 3 is a transverse section showing the body and shoes assembled.

Figure l is a fragmentary section on hne 4.-4 of Figure 3. Y c Y Figure 5 is a section on line 5--5 of Figurel. f j' Figure 6 is a perspective view, showing one form of the key hereinafter described.

Figure 7 is a fragmentary sectional view, showing a different form of key. Y

Figure 8 is a perspective view of the key shown by Figure 7.

Figure 9 isy a perspective view, showing a'modification of the cross-head body. Figure 10 is an end view,l showing a modification of the shoe.

The same reference characters indicate A.the

same partsy in all of the figures.

, Referring first to Figures 1 to 5, inclusive, 124 designates the body, and 13, ,13.the shoes constituting members of a cross-head veine bodying the invention. The shoes and the portions of the body withV whichthey cooperate are alike, so that a descriptionv of cRossiaEAD.,

1e,l 1925. serial No. 75,835.

edge walls by 15, said walls constituting av joint element. By longitudinally tapered I mean that the width of the groove in'- creases from one end to the-opposite endiof the body, as shown by Figure 1. Extending through the opposite side faces ofthe body and the edge walls l5, are alined slots 16. j On the inner face of the shoe is formed al longitudinally extending and longitudinally tapered dovetail rib 17, constituting a joint element complemental to the joint element first described thewidth of the rib increasing from one end to the opposite end of the body, `as shown by Figure 2. Said elements, when` interengaged', confiney the shoe against sidewise movementv outward from the body and permit separation of the shoe from the bodyby a longitudinal movement of the shoe in one direction only, indicated by the arrow X. The longitudinal taper of the joint elements confines the shoe member against endwise movement in one direction `from a predetermined position on-the bod member, and permits removal of the shoe memberby an endwise movement thereof, in the opposite direction. The continuity-of the rib V17 is interrupted by a transverse keyway 18 (Figure 2),which registers with theslots 16, when the shoev` is in said predetermined position, which is its operative position on the body.,I

20 designates a tapered key, insertiblez in said keyway and slots, and conforming to y `positiomflhekeywhen thus confined conlines the shoe memberin the predetermined to rcause its oblique edges to operative position whichy it assumes when l the edge walls of the tapered rib bear on the edge walls of the tapered groove and vprevents endwisemovement of the shoe relative to. the body in the direction permitted by the longitudinal taper of the rib and groove when the key kis removed. Sidewise movement of the shoe outward from the f 6oV Y j joint elements may be reversed', assliown by vbody is at the same time prevented by the and confining the key may be variously emy,

bodied, as shown Vby `Figures 3,5, 6, and 7. The key maybe provided with a threaded sha-nk 2l, projecting from one -ofi-ts ends,

and with a nut 22, engaged with the shank and adapted to be set up against one 'of the side faces of the body l2, and thus exert a'pulling required to cause the binding ot the oblique edges of vthe keyonfth'e oblique sidewalls ofthe keyway. The alternative means shown by Figures 7 and 8, includes an vear 23, formed on one end of the key., and provided withan orifice 2e (Figure) `and aheaded screw 25, enh gaged with a tapped socket in the body l2, the screw passing through the orifice 2d, and its head bearing onthe vouter side ot the ear, so that, when the scren'ivis'adjusted inward, its head eXeits pressure Von the ear in the directionY requirednto cause the binding of the edges of the key on the side walls vrot the keyway.y `f

Each form of key-adjusting means constitutes a take-up device cooperating with the key and withone of the cross-head parts, to maintain the key in binding engagement with key-engaging means provided byA the side walls of the'keywa-y, and -tocompensate for wear. i 1t will be seen that the shoe is conlined against lengthwise Vmovement in oneV direction, and against outward sidewise movement, byY the engagement ont its longitudinally taperedv dovetail rib 17 with the side walls y15 ot'- the longitudinally tapered dovetail groove in the body 12, 'and thatthe shoe is conned against endwise movement in the opposite direction by the bearing of the edges of the key on the side walls of the keyway. The key constitutes aV one-piece locking element, and is a substitute 'for the plurality ot'bolts heretofore usedto secure the shoe to the body, so thatthe'number and lcost of the essential parts, and the timerrequired' in assembling the 'same,rand in compensating` for wear',are materially reduced. ..2 3.7' n

' Owing to the tapering form of the key, a

slight endwise adjustment thereof is suiiicient to compensate for wearof the oblique edges of the key and theside' walls ot the keyway, so that.; such wearmay be quickly compensated for bythe simple' operation of longitudinally adjusting the key. i v The longitudinally extending `dovetail Figures 9 and 10. Figure 9 .shows adovetail rib 17EL formed on the body 1Q, the keyway insaid rib being designatedby 18a.

Figure l0 shows the ldovetail grooveformed vtorce on the kkey in the direction sembling the parts and adjiistiiigthe' keyn is as already described.

Owl-ngjto the act, that lthe undercut edge walls le ot tne groove le diverge from each other and impart a longitudinal taper to the groove, ysaid walls collectively constitute a tif-,fo-part endv abutment cooperating with t-he ycorrespondingly vvundercut and diverging edge walls of theiib 17, in limiting endwise movement oit the shoe member lin one direction, so that theshoe member is movable' on the body 'member Ato -an` operative` position determined by j vsaid two-part' abutment. The shoe member iscoiitined by said abutment along substantially its entire length,

the edge wallsl,fconstitutingfsaid abuti' nient, performing the major vportion of the 'dutyiot holding theshoe in its operative position. rlhe opposed abutmentv `l'ormed by the one-piece key' 20, is therefore' required to perloini only` the minor duty of; confining i the shoe against the twofpart abutment. For the peitormanceyoit this duty, the key'QQ, which may be quicklyapplied andremoved, is suiiicient. .n 1 fr f claim: 'l f l, A locomotive cross head comprising,in

combination,.'a body member,a shoefmeinber removably seated on fthe1 body member, one of said members havingal longitudinally eX- tending dovetail groove, whose undercut. edge 1 walls divergeroin eachl otherftrom end to endoit -tliegro'ove, so thatthe grooveis 1ongitudinally tapered, thei other -meinberhaving 'a longitudinally extendingk dovetailrib ics whose undercut edge walls divergel from each other-from end to'end ofthe rib, so that the rib is longitudinally iltapered, the edge lwalls o' thel'groove collectively forming a two-part abutment Cooperating 'With the edge walls voit the rib to limitVv endwise movement ot the shoe member in one direction only,`so that the shoe member is -movable on the body memberv to an'y hoperative position .l

determined" bys'aid labutment,and ris confined against outward side-Wise movement by the interengagement ot'said walls', one member being provided with a Vrtransverse''keyway, andaone-p'iece key separablyconnected with tliebody and? extending through-slots formed in its'reception'.fiortliev other of said members, and through said key-way,fsaidV key' constituting. an endfla-butment confining the edge wallsV of the rib against-the said twog-part abutment, means lbeing'provided 5:2.' Alocoinotive cross-head comprising, in

vtoi'-releasably-securingthe key in its operative position. y

combination, a body portion, having a 1ong-itudinally extending dovetail groove, Whose 'undercut edge Walls diverge Jfrom each other ing alongitudonally extending dovetaii rio,

Whose undercut edge walls diverge from each other from endpto end of the rib, so that the rib is longitudinally tapered, the rib being provided with a transverse key- Way, the edge Walls of the groove collectively i'orming a two-part abutment cooperating with the edge Walls of the rib, to limit end- Wise movementv of the shoe in one direction only, so that the shoe is movable endvvise on the body toan operative position determined by said abutment, and is confined against outward sideWise movement by the interen- ,y 'gagementwof said edge Walls, and a one- .Y piece key separably connected With .the body, and extending through the slots formed for its reception therein, and through the keyway, said key constituting an end abut' ment cooperating With the keyvvay in confin,`

ing the edge Walls of the rib against the said two-part abutment. means being provided for releasably securing thef'key in its operative position.

In testimony whereof I have alixed my signature. I

HARRY GUEST. 

